- small changes;

includes/core/um-actions-register.php

@@ -333,7 +333,7 @@ function um_submit_form_register( $args ) {
 		}
 		$user_login = sanitize_user( strtolower( remove_accents( $user_login ) ), true );
 
-		if ( $user_login ) {
+		if ( ! empty( $user_login ) ) {
 			$count = 1;
 			$temp_user_login = $user_login;
 			while ( username_exists( $temp_user_login ) ) {

readme.txt

@@ -155,6 +155,11 @@ The plugin works with popular caching plugins by automatically excluding Ultimat
 * To learn more about version 2.1 please see this [docs](https://docs.ultimatemember.com/article/1512-upgrade-2-1-0)
 * UM2.1+ is a significant update to the Member Directories' code base from 2.0.x. Please make sure you take a full-site backup with restore point before updating the plugin
 
+= 2.1.16: March xx, 2021 =
+
+* Bugfixes:
+  - Fixed user creating without username but based on first+last name with not-ASCII symbols
+
 = 2.1.15: December 24, 2020 =
 
 * Bugfixes: